I recently downloaded a CS 5 trial It is now expired and I cannot open pdf files without getting a dialog box asking me to buy CS 5.
Can you help?
I suspect that there's more to this than you've mentioned since Adobe Reader doesn't come with the trial.
My guess would be that Acrobat (that comes with the trial) has taken over the file associations for PDF files. You can change that by changing the file associations in your OS (but we don't know what that is since you haven't mentioned it).
Another thing to try would be, uninstall the CS5 trial, download and reinstall Adobe Reader. That should set your associations straight.
Thank you for the reply. You are correct. I still plan to buy CS 5, so I did not want to uninstall, but what I did after I left this post, was to uninstall the version of reader on my computer and reinstall reader from Adobe's site. That worked.